BIBDS OP NOHTH AND MIDDLE AMEEICA. 



91 



or grayish white; bill black; iris brown; legs and feet blackish or 

 dusky horn color. 



Yotmg.^— Above soft dark drab gray, sometimes faintly glossed with 

 greenish; rump dull white, and tertials edged and margined termi- 

 nally with white; a white supraloral line, as in adults; under parts 

 usually faintly tinged with pale brown on chest and sides of breast. 



AchiU male.— L&ngth. (skins), 105-124 (114.5); wing, 95-105 (98.3); 

 tail, 40^6 (42.4); exposed culmen, 7-8 (7.1); width of bill at frontal 

 antise, 6-7 (6.1); tarsus, 10-11 (10.9); middle toe, 9-11 (9.8).« 



Adult female.— Length, (skins), 106-120 (114.4); wing, 92-99 (95.6); 

 tail, 40-44 (41.6); exposed culmen, 7-8 (7.5); width of bill at frontal 

 antise, 6-7 (6.3); tarsus, 11; middle toe, 10.* 



Coast districts of middle Mexico, in State of Vera Cruz (Gutierrez 

 Zamora, etc.), and Sinaloa (Mazatlan) southward through southeastern 

 Mexico (including Yucatan) and Central America (both coasts) to 

 Isthmus of Panama, and along Pacific coast of South America as far 

 as northern Peru (Chepen)." 



Petrochelidon leucoptera (not Hirundo leucoptera Gmelin) Laweence, Ann. Lye. 



N. Y., -yii, 1862, 317 (Panama). 

 Petrochelidon albUinea Lawrence, Ann. Lye. Nat. Hist. N. Y., viii. May, 1863, 2 



(Panama; eoU. (x. N. Lawrence). — Sclatek and Salvin, Proc. Zool. Soc. 



Lond., 1864, 347 (Panama). — Salvin, Ibis, 1866, 192 (Guatemala to Panama, 



both coasts). 

 Hirundo albUinea Baird, Review Am. Birds, 1865, 300 (Mazatlan, w. Mexico; 



San Jos6, Guatemala; Panama E. R. ). — Zeledon, Cat. Av. Costa Rica, 1882, 



5. — Salvin and Godman, Biol. Centr.-Am., Aves, i, 1883, pi. 15, fig. 1. 



3 Fifteen specimens. 



b Eight specimens. 



Specimens from different localities average in measurements as follows: 



Locality. 



Wing, 



Tall. 



Ex- 

 posed 

 culmen. 



Width of 

 bill at 

 frontal 

 antise. 



Middle 

 toe. 



MALES. 



Five adult males from eastern Mexico (State of 

 Vera Cruz) 



Four adultmales from western Mexico (Tepic and 

 Sinaloa 



Two adult males from Yucatan 



One adult male from Guatemala 



Two adult males from Nicaragua 



One adult male from Isttimus of Panama 



FEMALES. 



Two adult females from eastern Mexico ( Vera Cruz ) 



One adult female from Oaxaca 



Two adult females from Tabasco 



One adult female from Yucatan 



One adult female from Nicaragua 



One adult fema,le from Costa Rica 



100.2 



97 



100.5 

 96 

 96 

 97 



97 

 99 

 95 

 92 

 94 

 96 



42.8 



42.5 



43.5 



42 



40.5, 



42 



42.5 



44 



41 



41 



41 



40 



7 

 7 

 7 

 7.5 



6 



6.5 



6 



11 



10.8 



11 



11 



10.5 



11 



11 

 11 



10 

 9 



10 

 9 



11 



10 

 10 



11 

 11 

 U 



10 



xo 



10 



"1 have not seen specimens from south of the Isthmus of Panama. 



